Google Web Toolkit (GWT 2.0) is an open source tool for developing Web applications based on Ajax with Java. GWT 2.0 is a platform for application development consists of a Java class library, AJAX-style UI components (widgets), an RPC-based request or response communication framework and an integrated debug environment.

Its objective is to promote the efficient development of high-performance web applications without the developer must be an expert in browser quirks, and JavaScript XMLHttpRequest. GWT is used by many products on Google, including Gmail, Google Maps, Google Wave and the new version of AdWords. It is open source, completely free, and used by thousands of developers around the world. GWT emphasizes reusable, efficient solutions to the challenges of Ajax, namely asynchronous Remote Procedure Calls, management history, bookmarks, internationalization and cross-browser portability.

What is Google Web Toolkit?

* software development framework in Java that can write AJAX applications.
* Can be used to develop and debug AJAX applications in Java for Java development tools of your choice, such as NetBeans or Eclipse.
* Java to JavaScript compiler provided and a special Web browser that lets you debug your GWT applications. When you install your application to production, the compiler translates your Java application to browser-compliant JavaScript, CSS and HTML.

Why Google Web Toolkit ?

* There is no need to learn or use JavaScript
* There is no need to deal with incompatibilities and quirks of Navigator
* There is no need to learn or use DOM APIs
* There is no need to forward or back browser history buttons
* There is no need to create commonly used Widgets

Google Web Toolkit Features

Dynamic and reusable UI components
Simple RPC mechanism
Browser history management
Support for full-featured Java debugging
GWT handles all cross-browser issues
Support for using Google APIs in GWT applications
Common JavaScript errors, such as typos and type mismatches are caught at compile time.

Google Web Toolkit is a Java framework to build more and better web applications in 2010 and probably in the coming years. It combines ease of deployment, portability, almost all web browsers without any additional plugins, easy to use and extend. Of course, most applications are still cases in which GWT does not work, but a minority of them.